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The peculiar Type Ia supernova iPTF14atg: Chandrasekhar-mass explosion or violent merger?
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 14
2016 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 459, no 4, 4428-4439 p.Article in journal (Refereed) Published
Abstract [en]

iPTF14atg, a subluminous peculiar Type Ia supernova (SN Ia) similar to SN 2002es, is the first SN Ia for which a strong UV flash was observed in the early-time light curves. This has been interpreted as evidence for a single-degenerate (SD) progenitor system, where such a signal is expected from interactions between the SN ejecta and the non-degenerate companion star. Here, we compare synthetic observables of multidimensional state-of-the-art explosion models for different progenitor scenarios to the light curves and spectra of iPTF14atg. From our models, we have difficulties explaining the spectral evolution of iPTF14atg within the SD progenitor channel. In contrast, we find that a violent merger of two carbon-oxygen white dwarfs with 0.9 and 0.76 M-aS (TM), respectively, provides an excellent match to the spectral evolution of iPTF14atg from 10 d before to several weeks after maximum light. Our merger model does not naturally explain the initial UV flash of iPTF14atg. We discuss several possibilities like interactions of the SN ejecta with the circumstellar medium and surface radioactivity from an He-ignited merger that may be able to account for the early UV emission in violent merger models.

Place, publisher, year, edition, pages
2016. Vol. 459, no 4, 4428-4439 p.
Keyword [en]
hydrodynamics, nuclear reactions, nucleosynthesis, abundances, radiative transfer, methods: numerical, supernovae: individual: iPTF14atg
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-134292DOI: 10.1093/mnras/stw962ISI: 000379830700077OAI: oai:DiVA.org:su-134292DiVA: diva2:1026904
Available from: 2016-10-04 Created: 2016-10-03 Last updated: 2017-11-30Bibliographically approved

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Kromer, MarkusFremling, ChristofferAmanullah, RahmanFransson, ClaesGoobar, ArielTaddia, FrancescoSollerman, Jesper
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Physics
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Monthly notices of the Royal Astronomical Society
Astronomy, Astrophysics and Cosmology

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